Malicious PDF — malware analysis report

Static analysis result for SHA-256 522c33460f31ba75…

MALICIOUS

PDF

75.4 KB Created: 2021-04-15 09:03:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 74b655fa06d8d1ee95922adfe6e8ce93 SHA-1: 2317f87d97e242a273e688ccb867eb4689f69a8a SHA-256: 522c33460f31ba7507a87f5d79ed638cb9c79277e3fc9f4dbfac1ad32a8f735b
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, containing numerous external links, many pointing to disposable hosting. The document body, though heavily obfuscated, suggests a lure related to 'principal engineer' roles, likely to trick users into clicking malicious links. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botokaw.ru/strik?utm_term=what+makes+a+good+principal+engineer PDF link annotation
    • https://waduwira.weebly.com/uploads/1/3/0/9/130969623/zotami.pdfIn PDF document text
    • http://sadovik.me/emsisoft_anti_malware_freeware5svuw.pdfIn PDF document text
    • https://motodamoz.weebly.com/uploads/1/3/1/4/131452818/5050545.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472221/normal_5fd6723054bb2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527108/normal_5ff29175c9430.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462697/normal_6007e5655f293.pdfIn PDF document text
    • https://nanupiwe.weebly.com/uploads/1/3/1/6/131606486/4629287.pdfIn PDF document text
    • http://sberbank.link/virtual_goaltender_apk_free_downloadlmjdw.pdfIn PDF document text
    • http://guginegafofa.iblogger.org/blink_to_speak_book.pdfIn PDF document text
    • http://vidclips.design/kitchenaid_superba_double_oven_fan_noise7xbb3.pdfIn PDF document text
    • http://reflectionss.space/bapadurovopexejanawasugi9m9rh.pdfIn PDF document text
    • http://zudezipebij.22web.org/aot_is_armin_really_dead.pdfIn PDF document text
    • https://ranekiwoj.weebly.com/uploads/1/3/0/8/130814960/3544170.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392457/normal_5fcf7fd8aee62.pdfIn PDF document text
    • http://ersoil.fun/nipijopofzkcj7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c5e26362-acc3-4c40-9db4-ce0cbd355080.filesusr.com/ugd/681527_198b094c0c5d457daefafb32263dcf4f.pdf?index=trueIn PDF document text
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_286f7016c03a41aeae3b25bcfdbf10f2.pdf?index=trueIn PDF document text
    • http://puviseb.epizy.com/niperenuvofifisimifub.pdfIn PDF document text
    • http://satanomoxa.rf.gd/96904457142.pdfIn PDF document text
    • https://fa886832-b9e3-4ce5-a98c-97da2614721f.filesusr.com/ugd/9f8050_dfb50ba3c8f246e98f0833be23a36b1f.pdf?index=trueIn PDF document text
    • https://ac614e2c-2e00-43e4-a80f-2c6bce9fb64b.filesusr.com/ugd/f103bb_01032c0943f04c72b777eb41d0424126.pdf?index=trueIn PDF document text
    • https://de2ee6d5-caaa-4265-b15c-40100ab77d99.filesusr.com/ugd/d43733_60bbb9708dd942ca83c33640e0eebedc.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_off0000e849.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE849 5564 bytes
SHA-256: ab22b988a961acdc1696deab79db02e57ebb39a61b50c1f92b2a525c4e9c90ee
font_01_sfnt_off0000fb17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB17 10856 bytes
SHA-256: d3b6b94c3a3fc602b94ebca6b5351706e2fb219bf06d64e66303337cc2352c4b