Malicious PDF — malware analysis report

Static analysis result for SHA-256 22419799899ed718…

MALICIOUS

PDF

76.3 KB Created: 2021-03-27 16:04:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 69fe3604cef051c12c079bdb72929228 SHA-1: d06fc2f64ea156e0707a7ea96e1286c27534a240 SHA-256: 22419799899ed718ba8b3fc0bfa7e25e862ae888c3d123817be44cc8f53b4f8f
206 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically as a phishing or SEO spam lure. It contains a large number of external links, many hosted on disposable domains, suggesting an attempt to manipulate search engine results or redirect users to malicious sites. The document body, though heavily obfuscated, contains text related to 'integrated math answers', likely a pretext to encourage clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://botokaw.ru/123?utm_term=integrated+math+1+volume+1+answers PDF link annotation
    • https://cdn.sqhk.co/safubuguva/icRKhDs/poligirirojejagun.pdfIn PDF document text
    • https://titenukom.weebly.com/uploads/1/3/4/5/134523185/5566681.pdfIn PDF document text
    • https://cdn.sqhk.co/zukasedu/8jMhcd9/wetesiseluvusireka.pdfIn PDF document text
    • https://cdn.sqhk.co/buzunonoj/h0qiahf/61030135026.pdfIn PDF document text
    • https://cdn.sqhk.co/vadavenaw/ihbygek/ponovanozosavedoji.pdfIn PDF document text
    • https://moxitamun.weebly.com/uploads/1/3/4/0/134040854/limifisisuburi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1ebd2cb-3427-4db8-b8a6-fb22f572fa12/plantronics_voyager_legend_bluetooth_headset_drivers.pdfIn PDF document text
    • https://8ed62699-7d02-4439-b935-4286882ef7d4.filesusr.com/ugd/229b11_04709fadbd704a88a41602a914f8eb48.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/340c2e88-3722-45ea-85df-9f68ee84d63c/kakapasadit.pdfIn PDF document text
    • https://569e8712-2873-4b93-a654-ea71b6b809e3.filesusr.com/ugd/345929_953d826d297c487ea8629a0d60d94702.pdf?index=trueIn PDF document text
    • https://ad177677-9664-42cd-9bf2-17a10eef6e1d.filesusr.com/ugd/f8915e_820a087318954671836ced2c5c190b42.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/36f839d0-8ea8-43b7-9713-c36f6d4fabdd/best_old_school_songs_70s.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59104b0b-c697-48bd-a36a-0431f386b555/banetumenomugovosalol.pdfIn PDF document text
    • https://b4e79a3f-0083-4b26-8056-4fe87fb46dfd.filesusr.com/ugd/332c1b_dd935fa046fa465489a69faac2925126.pdf?index=trueIn PDF document text
    • https://58f604bd-1fd8-4cfe-af9b-f15e67d030d5.filesusr.com/ugd/9a7439_81056918c2594e489655bf3c103fa88a.pdf?index=trueIn PDF document text
    • https://fab88ded-2f12-46c9-b6ec-f290036286cc.filesusr.com/ugd/cce69c_dc344d2d1e464ce584cacb0d44543d63.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/2fe71793-9ba7-4e4c-a7a7-d432b1c7ae14/91628264472.pdfIn PDF document text
    • https://f635e5d9-31b1-4f19-b758-7a623be10181.filesusr.com/ugd/6cf0f5_e4174bca2b9d48ffaae72d810a8ca417.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba408fbf-643c-4a4e-a129-f3acb808ca52/92247136433.pdfIn PDF document text
    • https://8c56b32b-3398-45d6-9c0b-b55146621f16.filesusr.com/ugd/6924eb_b558a89147764a01a997e7ea6daf7904.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7af059ac-f100-4c92-b10d-8bff33fcd1c3/west_virginia_economic_development_grants.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7e4d951-ffa9-43be-a8e5-a1088652e47f/dometic_rv_air_conditioner_recall.pdfIn PDF document text
    • https://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_2aca256e63224d30ac8e8d273fa21c05.pdf?index=trueIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8E 5380 bytes
SHA-256: e4ab765a99d6aff7522c201eefbca592937ed0f44566866c6f80c8c3e9867ce4
font_01_sfnt_off0000fdca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCA 11224 bytes
SHA-256: b3285f51895a7852c45c424c3ab581eb5dcebdd31faae61a4fb5ba9108bfa8b2

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