Malicious PDF — malware analysis report

Static analysis result for SHA-256 eb50fcecb80048f2…

MALICIOUS

PDF

70.6 KB Created: 2021-02-17 15:43:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: e7c5e3726b13a8e018305eb96b63c1f1 SHA-1: 0cc21a57aa67efe1a825af3fa9d597216727883a SHA-256: eb50fcecb80048f2b295008b5eb9d8433f75b34a27df9ccb299d770ace7f7354
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://jottigo.ru/wix?keyword=irrational+numbers+worksheet+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4462730/normal_5ff280d6443d2.pdfIn PDF document text
    • https://cdn.sqhk.co/setuboluraje/dvIhejg/pet_battle_simulator_codes_wiki_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/gituridewo/clnge1i/11820859594.pdfIn PDF document text
    • https://liletalezawo.weebly.com/uploads/1/3/4/5/134591830/jinumedobumiv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380411/normal_60004a3a88e43.pdfIn PDF document text
    • https://cdn.sqhk.co/gogojiranat/hibZjfb/xewadokupode.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444377/normal_5fc7d716d33af.pdfIn PDF document text
    • https://gojojiwegojefuw.weebly.com/uploads/1/3/2/6/132695574/4384068.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372955/normal_5ffd39ed2480e.pdfIn PDF document text
    • https://mosivupidener.weebly.com/uploads/1/3/1/6/131637589/3a11670cb28b4e1.pdfIn PDF document text
    • https://bituxusod.weebly.com/uploads/1/3/4/3/134347303/sadozetapafunazozo.pdfIn PDF document text
    • https://cdn.sqhk.co/feripamapuv/hev2hhb/62652008403.pdfIn PDF document text
    • https://sekikeke.weebly.com/uploads/1/3/4/7/134739811/5421853.pdfIn PDF document text
    • https://bevowodawalejap.weebly.com/uploads/1/3/4/3/134363876/bisomobu.pdfIn PDF document text
    • https://pulolated.weebly.com/uploads/1/3/0/7/130740140/wuwidulo-tufeberilen-waritar-xilizikel.pdfIn PDF document text
    • https://toxutumopomepe.weebly.com/uploads/1/3/5/3/135327812/gamaza_paviramere_bevavebupa_jelofu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465688/normal_601cb2fd752ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457312/normal_5fd8c17e19cca.pdfIn PDF document text
    • https://monemoret.weebly.com/uploads/1/3/4/6/134667898/2189530.pdfIn PDF document text
    • https://ligexuvuzi.weebly.com/uploads/1/3/0/8/130814340/c3eec7c19028.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000d894.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD894 5156 bytes
SHA-256: 1becdc86e7eb9862d1df973ce6df92a66c820d3c5f9a92dddd668b800e7734b5
font_01_sfnt_off0000ea00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA00 10228 bytes
SHA-256: 44a17832c66a4b48a2975134f28f4058bb07373c9978081d6667488d4fea626b

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