Malicious PDF — malware analysis report

Static analysis result for SHA-256 db2f1555cfa395e7…

MALICIOUS

PDF

80.5 KB Created: 2021-03-17 13:07:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: f9041f7ecd1b2ec9e2564a8430a4bb12 SHA-1: c3f12115040b65f57c55bc3509d7892b1d63c5fa SHA-256: db2f1555cfa395e739f586287b4778ea326ee1ee9f740ec9d02602b232334328
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are on disposable hosting and utilize UTM parameters, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified the file as malicious, specifically a phishing trojan. While no scripts were extracted, the presence of numerous external URLs suggests an attempt to redirect users to malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://ponafet.ru/123?utm_term=formlabs+castable+wax+review PDF link annotation
    • http://shoop-fk.ru/semicolons_lesson_year_5zwocf.pdfIn PDF document text
    • http://kasyanbeauty.com/90900719750bkd5q.pdfIn PDF document text
    • https://kunexiravirub.weebly.com/uploads/1/3/5/3/135344507/9526466.pdfIn PDF document text
    • https://fiwisito.weebly.com/uploads/1/3/4/7/134715438/wuneponodok.pdfIn PDF document text
    • https://bagerukuvimi.weebly.com/uploads/1/3/2/8/132815916/gexewijimoxa_tigirojabafi_pagiremav.pdfIn PDF document text
    • http://rimka.xyz/ingenuity_inlighten_baby_swing_batteriesiw0qe.pdfIn PDF document text
    • https://rurusoweloxefug.weebly.com/uploads/1/3/3/9/133989150/rasabewemel.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a679ea6c-4403-4dbc-a5c7-d8f8910990f1/betagivote.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21a30c73-eec8-4568-980c-1fb62d9f2215/67862897956.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6e78dfb-fa8b-4351-8e8b-a785a641425f/79934187669.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de63cbcb-bb8b-4dd0-9bad-fad72ddf34bd/79593269647.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4fd9a513-fbe0-44ad-b8d5-eaaa87591968/sixebewabopogituxuluneze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac3ee946-1095-45b2-94c2-a0eba59aa5ca/rirenexevodijukawemerus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4aa84b47-c92c-4a3f-869d-11f0c5048d15/how_to_lock_a_panasonic_inverter_microwave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43be9a2f-9ec4-40d0-913e-8cc36ab95c2f/scientific_method_labs_for_high_school_biology.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/094da697-b841-4f99-af54-393919920b6f/firehouse_subs_menu_sizes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88d3116f-bba6-471c-917a-877dffd5e182/priscilla_shirer_armor_of_god_week_1_answers.pdfIn PDF document text
    • https://68e1e3d4-268d-49bc-a8aa-b119cb10fea7.filesusr.com/ugd/3ceeb9_7ea1907d34d94d489f43f267608caf51.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d095200-e71a-4664-aa13-4cc76ab87962/96486095469.pdfIn PDF document text
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_f1e53725f2fe4178be42699cbe7d2d9b.pdf?index=trueIn PDF document text
    • https://089130c0-62ae-4bf1-a93c-656440fe8451.filesusr.com/ugd/738632_72c9b8843dff4ae89ffa9c80405c12bc.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8493a157-1526-4e64-8ac8-4eb3b60fc96b/xfinity_dvr_box_size.pdfIn PDF document text
    • https://6196a4e6-b3b5-4a85-a139-4ec84e0a53d9.filesusr.com/ugd/d01287_02fcdbd8caca4d869631f976ad5cb5de.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_off0000fb2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB2A 5260 bytes
SHA-256: 32d61668b2c0ef8a7196dd1629b1131938f19b4e998f06035251f4db9f791f92
font_01_sfnt_off00010d0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D0C 11764 bytes
SHA-256: e5bd00f9b9d98023dd32735eff24b2f065ce685af8eb0e1d6bb313ee6efad4fb