Malicious PDF — malware analysis report

Static analysis result for SHA-256 70505d2c0be51661…

MALICIOUS

PDF

84.8 KB Created: 2021-03-17 17:15:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 7591093e709e34b5071b85e022ecdea6 SHA-1: f31153ea3c4dc2fae47f94bc421a9ed1c79ef651 SHA-256: 70505d2c0be51661f7118e2592a89070399e84001a2b11d73c95ef339b15bfcb
244 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. One critical heuristic identified links to known malicious redirector infrastructure. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/wix?keyword=flag+worksheets+for+kindergarten In PDF document text
    • http://leftoutclub.com/arne_jacobsen_station_alarm_clock_manualm1xeg.pdfIn PDF document text
    • http://hookup755.fun/xerexemewadowe18ghy.pdfIn PDF document text
    • http://bogplaktnc.fun/linen_dinner_napkins_monogrammedxmojz.pdfIn PDF document text
    • https://lolejubabam.weebly.com/uploads/1/3/1/3/131379737/devozekol.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410679/normal_60322e1769038.pdfIn PDF document text
    • https://pogudemuzam.weebly.com/uploads/1/3/4/0/134018755/9233194.pdfIn PDF document text
    • https://kerozutovazo.weebly.com/uploads/1/3/0/8/130813796/55a49d78d3f.pdfIn PDF document text
    • https://lumodafudewose.weebly.com/uploads/1/3/4/4/134480169/80f8cb88f0.pdfIn PDF document text
    • https://ponuwusareti.weebly.com/uploads/1/3/1/6/131636782/8643998.pdfIn PDF document text
    • https://nusuxoxoli.weebly.com/uploads/1/3/2/7/132710665/9635350.pdfIn PDF document text
    • https://fazokovonopa.weebly.com/uploads/1/3/5/3/135329702/d69e666eef96335.pdfIn PDF document text
    • http://lenudes.com/960113775237jzkg.pdfIn PDF document text
    • https://bezebaterizijir.weebly.com/uploads/1/3/1/3/131384714/1649861.pdfIn PDF document text
    • http://just-gopro.com/why_the_sky_turns_red24p2h.pdfIn PDF document text
    • http://titanof-filtr.ru/tumunulesejo7x5ur.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453720/normal_5fdb2bd186f42.pdfIn PDF document text
    • https://bujozimadepaxed.weebly.com/uploads/1/3/4/6/134615651/bunuvitujugujit.pdfIn PDF document text
    • http://vannabanyavsedela.xyz/furman_5k_training_plant5yp9.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/9fbd6910-e178-4f72-b51c-289fca2b9ef5/vaxas.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db615d86-f2b9-40cc-85e6-5c09f6e0ad9b/57365700920.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a703a13-d693-4aca-8c57-6fccc68607db/93783872221.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/04efb281-55b8-4cf5-bcea-b23fa5053a37/el_mundo_mgico_de_terabithia_pelcula_completa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6839444-331d-4f61-b4bd-7f7d370800e3/2017_ap_english_language_and_composition_free_response_question_1.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f8b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8B1 5280 bytes
SHA-256: 37e3532fd465c4074d0431893b86511ba3d465c259a09dc042d099da5815d43e
font_01_sfnt_off00010ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB7 11148 bytes
SHA-256: e8314dc9d2a428cc6679ea661a12799beffe0b4114584fe150564f51c45b1e50
font_02_sfnt_off00013016.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13016 16144 bytes
SHA-256: 2a5f1667c2e343500efde63e3dd6a136498333968b1680966ac5eb34589f1174

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