Malicious PDF — malware analysis report

Static analysis result for SHA-256 97ef78236a220442…

MALICIOUS

PDF

142.1 KB Created: 2021-05-13 00:30:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ea5ec17e11e67736c7887c5bb66f25ef SHA-1: bc0b80d5773d4914d8e0687ad176843bf3150528 SHA-256: 97ef78236a220442c9ec625171136bc25075da3ab48f27f4c2c2cc0f99a97503
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm. The primary external URL, 'https://baarspo.ru/strik?utm_term=world+map+with+countries+oceans+and+continents', suggests a lure related to geographical information, likely to attract traffic or distribute further content. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing or trojan PDF.

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=world+map+with+countries+oceans+and+continents PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4450336/normal_6007506514ed8.pdfIn PDF document text
    • http://punejew.mygamesonline.org/89013773206.pdfIn PDF document text
    • http://nunobuzipame.medianewsonline.com/kuzefudixonidadizenasunib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367313/normal_5fcb5304ed060.pdfIn PDF document text
    • http://xoxuvajes.mywebcommunity.org/oxford_bookworm_stage_3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388163/normal_6016eba0dad28.pdfIn PDF document text
    • https://rapovadok.weebly.com/uploads/1/3/4/7/134705404/ponukixuk-kejujefetupube-sikuj-bababogonibap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480414/normal_60333168cde65.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502245/normal_602a40b69f20a.pdfIn PDF document text
    • https://zororoxuz.weebly.com/uploads/1/3/4/3/134309160/6e95facce0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377704/normal_5fd160b7e39a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454051/normal_5fe87cf53b006.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474462/normal_604fc1c446c60.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454967/normal_5ff8a1c95bd71.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://a4346b84-4611-49ab-b113-80c9188ca613.filesusr.com/ugd/078c79_b8caea0ef29444d9a8a15a710ac7e510.pdf?index=trueIn PDF document text
    • http://wazipegemezen.atwebpages.com/52404460982.pdfIn PDF document text
    • https://e668d0bc-6b9c-4787-ac64-5363b724ef62.filesusr.com/ugd/6ec699_1491496f8f084cb0b3ec148f1ad1c9b1.pdf?index=trueIn PDF document text
    • http://zejibanunepi.myartsonline.com/star_trek_picard_story_leaked.pdfIn PDF document text
    • https://18cb0a1d-3822-48a5-9ca0-56465202bc9b.filesusr.com/ugd/96564c_c38cf34ba5ce49d7a0a8def636ee6970.pdf?index=trueIn PDF document text
    • https://536432c6-7160-4795-b32c-faef63afc1c8.filesusr.com/ugd/5e2347_7bdaa836473446c78fa02e7c99827476.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_off0001f05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F05D 5420 bytes
SHA-256: 8c015a946d514ea461c23b781f150e2a5ebacd249881d0d9e6255c27c9fe4459
font_01_sfnt_off000202ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x202AE 11800 bytes
SHA-256: 6e72b73bf92e4a56fd337c334bfbfec8759282ee84fbac97e6637a0f37a8c31b

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