Malicious PDF — malware analysis report

Static analysis result for SHA-256 e77bb8bd5cdf9232…

MALICIOUS

PDF

75.1 KB Created: 2021-03-11 12:24:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 3a6048beb9062078a189664aae606dbe SHA-1: e7b38e1ee3c2f5bfaed85a28ce6143099a9f04ef SHA-256: e77bb8bd5cdf92320a53aee166297f7b89ad8ac8ac4905485e32fd85874b8349
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/123?utm_term=2017+field+operations+guide+ics+420-+1 PDF link annotation
    • http://kosamaritaj.getenjoyment.net/lg_dishwasher_3850dd3006e_no_power.pdfIn PDF document text
    • http://pumba-timon.space/radimowewt9fj5.pdfIn PDF document text
    • http://keniworu.mywebcommunity.org/tonoxeb.pdfIn PDF document text
    • http://sezejawi.mypressonline.com/donorilowag.pdfIn PDF document text
    • http://policyhelpcenter.com/singer_4452_vs_4411k1x8p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426263/normal_60161576e9b85.pdfIn PDF document text
    • http://gojavodevagajuw.mygamesonline.org/17418463650.pdfIn PDF document text
    • http://rajukilodagoje.mygamesonline.org/does_family_take_a_singular_or_plural_verb.pdfIn PDF document text
    • http://wupunekum.getenjoyment.net/sixilove.pdfIn PDF document text
    • http://netzamka.ru/bosakuzodadukewekelorop0h76n.pdfIn PDF document text
    • http://dehydratedoriginalgoodness.com/90617387478i4mk3.pdfIn PDF document text
    • http://uorott.com/matukatsluaa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380405/normal_60264fc67b5ac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://zejibanunepi.myartsonline.com/craftsman_lt1000_16_hp_manual.pdfIn PDF document text
    • http://sazasewugekupej.onlinewebshop.net/5066893915.pdfIn PDF document text
    • http://kakasis.onlinewebshop.net/57757728967.pdfIn PDF document text
    • http://mifedisiso.atwebpages.com/how_to_draw_comics_for_beginners.pdfIn PDF document text
    • http://zeteximezoxa.myartsonline.com/bach_prelude_and_fugue_in_c_minor.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E4 5636 bytes
SHA-256: 0b05375042718fba3e8c26d114a45e09136114e354628cd5a4c4942ad4b778ac
font_01_sfnt_off0000ed27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED27 10560 bytes
SHA-256: 03f6d2665f0467123e9cdabc0a27e19d15e5f98a7021b71674ff22642570eead
font_02_sfnt_off0001111c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111C 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2