Malicious PDF — malware analysis report

Static analysis result for SHA-256 1556d739798dc6c7…

MALICIOUS

PDF

83.5 KB Created: 2021-03-08 23:39:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 6b48c9cacf561101dd1cbb2499b0df90 SHA-1: d375b170184cca30dcc0cbb72259c49ad74715b2 SHA-256: 1556d739798dc6c719ec516b743df36759be47c70e5b6a1c6af63a054effe7a8
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 pointing to disposable domains, indicating a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/wb?keyword=the%20new%20encyclopedia%20of%20modern%20bodybuilding%20the%20bible%20of%20bodybuilding%20by%20arnold%20schwarzenegger%20pdf PDF link annotation
    • http://electorat.org/the_hounds_of_baskerville_sherlock_plothp59v.pdfIn PDF document text
    • https://cdn.sqhk.co/rotonoba/jhPihhf/sonelinovod.pdfIn PDF document text
    • http://lnstagramlivesupportcenter.com/quote_about_the_sun_rising_and_setting2krsv.pdfIn PDF document text
    • http://50offshop.info/899850276275u6pt.pdfIn PDF document text
    • https://cdn.sqhk.co/konafomaz/ahchvr3/xijesumipejomekido.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481836/normal_600789b0cfc4b.pdfIn PDF document text
    • https://cdn.sqhk.co/wenewojufaj/haggiES/king_s_throne_game_of_lust_maiden_art.pdfIn PDF document text
    • https://cdn.sqhk.co/dagozuwemep/hdihjj5/okra_soup_nigerian.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453335/normal_60150fa6b9258.pdfIn PDF document text
    • https://cdn.sqhk.co/bogulevim/0jahgjc/53957154389.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376374/normal_5fce6795b7228.pdfIn PDF document text
    • http://proita.space/the_certified_six_sigma_yellow_belt_handbook_2nd_editionjs70k.pdfIn PDF document text
    • https://cdn.sqhk.co/wegodimumod/7sRPie9/fupema.pdfIn PDF document text
    • https://cdn.sqhk.co/dodanadofu/ejidEpO/11036082463.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/hifkhcZ/xuvewijisutexadejamow.pdfIn PDF document text
    • https://cdn.sqhk.co/bulunazi/jRijjgz/roxidamegoxugapi.pdfIn PDF document text
    • http://itanto.space/75632423772ynowh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://fb9345b8-40be-4608-a8ff-9c5427dba92f.filesusr.com/ugd/98d639_242431fc500349aeb8e9fae9259f0694.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/50e62240-c2a7-467e-bd5c-0726b69b5c79/keurig_elite_owners_manual.pdfIn PDF document text
    • https://4779f2f8-a33e-4327-9c78-21ee0bcf4620.filesusr.com/ugd/31bf02_190f32fa5a6f4b5a98427ee6e34b3821.pdf?index=trueIn PDF document text
    • https://2ffa788b-df2f-461f-b9c5-573bec542745.filesusr.com/ugd/374ce0_83a1780300fe43f0bff1b2f30dce5203.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/564459f6-609e-4d48-9a39-ad6f6df494d1/loparute.pdfIn PDF document text
    • https://0793e221-2e7e-4176-aae8-4ff4b75d8f7a.filesusr.com/ugd/64bd79_0610f29ab0014c9896f8f0ff9c11f71f.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/fac8ff3a-9f8e-4fa2-b706-0f457b166335/glenfield_model_60_scope_mount.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B2 5900 bytes
SHA-256: 81005bfd0499f39e056e7d1b2def8f0b758b90a1917354d6e56cdf3d0dc814a6
font_01_sfnt_off00011ac1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC1 10648 bytes
SHA-256: e91757a776678e1306d0f12ee945a35c2995db70825fe4e5aba9426268509d34