Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b4ea5782676d470…

MALICIOUS

PDF

82.0 KB Created: 2021-04-29 19:59:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 6fe78b6e35cf4227af8b67c93f6f8b7e SHA-1: ba773e9faad9e24a7d5fd87cd1ed9fa82a43ce48 SHA-256: 1b4ea5782676d470f534986517e670c57f1c0943bb33bab2faf55d0dc3384d62
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing operation. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs, such as 'https://baarspo.ru/strik?utm_term=how+to+factory+reset+a+motorola+e5+plus', are likely used to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • 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://baarspo.ru/strik?utm_term=how+to+factory+reset+a+motorola+e5+plus PDF link annotation
    • https://kibirurifawejax.weebly.com/uploads/1/3/4/6/134610443/kawugux.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503617/normal_5fdbbc4cc3634.pdfIn PDF document text
    • http://gladkoe-telo.xyz/bawowife88ney.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451754/normal_60059fcbeefbe.pdfIn PDF document text
    • http://50offshop.info/474110685843tcvj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464739/normal_604d7a664df9c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413368/normal_5ff9d637cf540.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414494/normal_5fea3d7e90f6e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446035/normal_601535edb41a9.pdfIn PDF document text
    • https://mifurujuxix.weebly.com/uploads/1/3/3/9/133997148/lemajoja_lebabonumogo.pdfIn PDF document text
    • https://cdn.sqhk.co/pulovafafita/fgiThxD/pofudubatafir.pdfIn PDF document text
    • http://basiditdcf.space/funny_true_or_false_quiz_questions_and_answersyre1y.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464869/normal_606e906590a2e.pdfIn PDF document text
    • https://cdn.sqhk.co/rubutemoxe/jjqLjdw/word_party_bedroom_decorations.pdfIn PDF document text
    • https://zorivaleguzovul.weebly.com/uploads/1/3/4/5/134596353/5705308.pdfIn PDF document text
    • https://cdn.sqhk.co/konosoka/ii2hi29/detegewakalafu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486356/normal_6013a3c599e94.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/e66bcd8c-6310-42f3-b901-bd990c48fefa/59292842231.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b968f11-24a7-4445-b1df-fef508239687/sony_fs700_video_camera.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6592101-6612-4608-96fd-d939e74e8cd5/dujapopuzijubavavixu.pdfIn 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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e97a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE97A 5440 bytes
SHA-256: 22a35d298e32bf0e6002a7aa869541d7d9cb4eef482f2b1b30e99a8a1c1732f9
font_01_sfnt_off0000fc07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC07 12404 bytes
SHA-256: 38e389a05081eeea528937e24ad83e8ef51d23a9e8bd00fd2914758e02fce553
font_02_sfnt_off00012511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12511 16080 bytes
SHA-256: ce6c9a31222968989703f653af24ef420cae08753b095152a9eff5d9cedd60e7