Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c9bbb1696bd1787…

MALICIOUS

PDF

82.8 KB Created: 2021-05-16 21:58:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 291ba9599d76ddde75a1a2811fc6bb1b SHA-1: 9f2c16045c549df973a55fd930e4affd04c35031 SHA-256: 8c9bbb1696bd17872719532543216ef46d12094b3f8ec561bade9163ef25ec82
154 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The document body, though heavily obfuscated, combined with the presence of numerous external URIs, suggests a phishing or scam attempt. The heuristic 'SE_URGENCY_LURE' and 'SE_CALLBACK_LURE' further support a social engineering attack vector, likely aiming to trick the user into clicking a malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 7

  • 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 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) or Microsoft license-boilerplate documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://nipisod.ru/strik?utm_term=ships+of+the+sea+maritime+museum+wedding+cost PDF link annotation
    • http://daating19.site/figurative_language_5th_grade_pptpzeag.pdfIn PDF document text
    • https://fuzizozole.weebly.com/uploads/1/3/4/6/134630054/fogusi.pdfIn PDF document text
    • https://cdn.sqhk.co/naxupowu/jj3gihg/traffic_rider_hacked_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/vinasujitupe/igVjdcj/diy_egyptian_costume_girl.pdfIn PDF document text
    • https://bupawajeba.weebly.com/uploads/1/3/5/9/135956748/gejurawaremukizud.pdfIn PDF document text
    • https://xewidepomizexas.weebly.com/uploads/1/3/0/7/130775014/121524dc668eff.pdfIn PDF document text
    • http://ukranews.icu/can_a_civilian_get_special_forces_traininghfd1u.pdfIn PDF document text
    • http://prodson.space/unearthed_arcana_5e_paladin0wbw7.pdfIn PDF document text
    • http://brumbum2.xyz/latest_3d_games_for_laptop_free7y8hf.pdfIn PDF document text
    • https://moxeduve.weebly.com/uploads/1/3/0/8/130814104/pekibovatapul.pdfIn PDF document text
    • http://idealica-italy.site/33584416094vkxs1.pdfIn PDF document text
    • https://cdn.sqhk.co/mokavokaven/egeihnZ/sakuzevizirigoga.pdfIn PDF document text
    • https://zeloruzo.weebly.com/uploads/1/3/5/3/135349371/wipita-xexugiku.pdfIn PDF document text
    • http://stankoff.org/zatopowurafulevkkxe5.pdfIn PDF document text
    • http://glasshookahcatering.com/slices_pizza_pizza_slices_gamesgshlt.pdfIn PDF document text
    • https://cdn.sqhk.co/zokuzadisup/jhMjfI6/rome_total_war_2_cheat_engine_research_rate.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/de516a2d-c0e1-4d8f-a213-62660ec6dcca/66260336920.pdfIn PDF document text
    • https://s3.amazonaws.com/guwutivupudutu/67515218918.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/22159611880.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/zozanodemujerojafiremega.pdfIn PDF document text
    • https://s3.amazonaws.com/nisiwanolom/gulivijiresimelopen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec7ddac3-fd26-4107-8afe-28ebba4d58e7/calories_taco_bell_crunchy_beef_taco_supreme.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_off00010296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10296 5732 bytes
SHA-256: d2d71d17f975ef9db496984ad0e493c8a1bc8b9149aefc27f34a3eb6ba02cef1
font_01_sfnt_off00011604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11604 11580 bytes
SHA-256: f7204ebdfe08b31c89688210cb8bcf7635904226e376e2439215b05df4792312