Malicious PDF — malware analysis report

Static analysis result for SHA-256 71cb93dddc763805…

MALICIOUS

PDF

102.5 KB Created: 2021-04-01 13:26:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 273115476c49172b6868d539fe50bf58 SHA-1: 733f00935762da9c85c5504a61f610f5a2e6e32a SHA-256: 71cb93dddc76380585cdcb510fb8e696388cc0de2d92ba9d28fe1f1c9825d293
186 Risk Score

Malware Insights

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

The PDF document was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it functions as a link farm or phishing lure. The embedded URLs, such as https://jottigo.ru/strik?utm_term=why+is+canada+gdp+per+capita+so+high, are likely used to redirect users to malicious sites. No scripts were extracted, but the PDF structure itself is indicative of a phishing or SEO manipulation attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jottigo.ru/strik?utm_term=why+is+canada+gdp+per+capita+so+high PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471099/normal_602fa5f00fbf7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487902/normal_6045ff859eba0.pdfIn PDF document text
    • https://cdn.sqhk.co/goluxewimabu/hhjcgia/repost_for_instagram_app_iphone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417327/normal_601b2866c6575.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475586/normal_606062e8d0a2e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495973/normal_5fc64a2f393e3.pdfIn PDF document text
    • http://xurefitobe.22web.org/esl_short_stories_for_beginners.pdfIn PDF document text
    • https://cdn.sqhk.co/nisikevepoxi/geEhnVW/black_spades_cards_meaning.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://19527f6f-7821-4b33-8e58-d909ab9a203f.filesusr.com/ugd/b18fc6_9e9475c969ad4897ba3e45e3982a6e06.pdf?index=trueIn PDF document text
    • https://5e04165b-6ab1-49a6-9937-45006fc2fbeb.filesusr.com/ugd/d19879_58481930f1ce4b33b08efaea9538e0b5.pdf?index=trueIn PDF document text
    • https://3e1af3dc-cf37-4f58-935d-0a6065bc5ce9.filesusr.com/ugd/3ca236_6980bafa6b39493496a105073fb3b972.pdf?index=trueIn PDF document text
    • https://82f7a8bd-e2a3-46ec-bdf8-dd4727f017fb.filesusr.com/ugd/a90de3_782f423295f8481582396a8a3e791dfa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/9129cb3e-b29b-456c-b96f-29e0bbd194a1/how_to_open_a_sentry_safe_digital_lock_box.pdfIn PDF document text
    • https://acfcda0b-1795-4b40-aedc-9a0bc13047ce.filesusr.com/ugd/89c6ad_294c8679d93a48c383c4f58791fb1186.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/df68bbbe-f1f0-45dc-8dae-3a4e7291781c/nancy_drew_season_1_episode_1_online.pdfIn PDF document text
    • http://fuzakumadobujav.epizy.com/acuerdo_cambio_climatico_paris.pdfIn PDF document text
    • https://8650d040-a33d-467d-a608-6706f181f11b.filesusr.com/ugd/61b8bf_5af5dd20283d4439acd930b16e966224.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_off00015339.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15339 5416 bytes
SHA-256: c8eed173ece21b605c814e33cd063c4af235be3c4a268f23da0e069d6736c29c
font_01_sfnt_off000165ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x165BA 11572 bytes
SHA-256: 8173ace76f77f443d8406e6dc3809605d8bd7a3cc682962fa4792262ec769b20

Open this report in the interactive analyzer, or submit your own file for analysis.