Malicious PDF — malware analysis report

Static analysis result for SHA-256 870a09d418b03098…

MALICIOUS

PDF

77.6 KB Created: 2021-03-09 14:24:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: bd1e9cae0eafc951a27e52c1c75dbb58 SHA-1: 2b0c1d1702534cb3f52a93e2b856ee45c3a83fee SHA-256: 870a09d418b030982417d9248496d30e945faf371141b093c589ec2fd1d4bf1f
244 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics and a machine learning classifier, indicating it is likely part of a phishing or spam campaign. It contains a large number of embedded links, many pointing to disposable domains, suggesting a link farm or SEO manipulation tactic to distribute malicious content. The presence of a link to a known malicious redirector further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/award?keyword=neurontin+davis+plus+pdf In PDF document text
    • http://tafagejiveduda.22web.org/landmarks_in_humanities_gloria_fiero.pdfIn PDF document text
    • http://duxasavorin.22web.org/fluval_fx6_hose_size.pdfIn PDF document text
    • http://digerutejonoju.22web.org/find_nash_equilibrium_2x2_calculator.pdfIn PDF document text
    • https://ruwiwiteviporiz.weebly.com/uploads/1/3/4/7/134767377/788aac9b619f7.pdfIn PDF document text
    • http://fuvesozufinefi.medianewsonline.com/44940151789.pdfIn PDF document text
    • http://rajukilodagoje.mygamesonline.org/harrisons_principles_of_internal_medicine_19th_ed.pdfIn PDF document text
    • https://bozaxadoduzake.weebly.com/uploads/1/3/4/3/134306622/kifuwosudezogu.pdfIn PDF document text
    • https://cdn.sqhk.co/fipimomozuk/2guidf3/39777648564.pdfIn PDF document text
    • https://koxiguxizabi.weebly.com/uploads/1/3/1/1/131163763/laloz.pdfIn PDF document text
    • http://keribek.22web.org/acdis_2020_pocket_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/mukujoripu/hQhajeO/lottery_scratcher_scanner_app.pdfIn PDF document text
    • http://kovatafob.mypressonline.com/cathtrisme_urtral.pdfIn PDF document text
    • http://gilumesu.mypressonline.com/how_to_clean_bosch_ascenta_dishwasher.pdfIn PDF document text
    • https://sazaburesifug.weebly.com/uploads/1/3/4/2/134265765/joworajozixam_woxuti.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://667abc8f-92ca-45d9-bc9d-789c80a68858.filesusr.com/ugd/dcd78f_0d081d09c63144719dc69237a49df637.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/matogapibelifiv/kenaverodojobibebixe.pdfIn PDF document text
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_c00526bc76a842aa9ef590003a8448dd.pdf?index=trueIn PDF document text
    • https://b84c3727-5d5a-4c5d-9d5d-21cac87b3a69.filesusr.com/ugd/fdd6c2_5c2eb1cc57c14b5e94401db02110aaea.pdf?index=trueIn PDF document text
    • https://a2c67b61-a01d-4053-b7ad-f1487bca8054.filesusr.com/ugd/24853a_562cf6e08ccf44a2a16d15ade44a2411.pdf?index=trueIn PDF document text
    • https://510adc33-753b-44c0-977e-8d34da8fcdd4.filesusr.com/ugd/5f4192_b1ca8689c98a49c6aba22695129c2700.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jedobufudajewu/watobiwanevuzixufalo.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_off0000f18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18F 5064 bytes
SHA-256: c38ab24468f0676a640e9964a9801e922bec2dcff372759fac99a6fb27a1392f
font_01_sfnt_off000102e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102E4 10864 bytes
SHA-256: f48a57c7e10b64fedf969891f6e28e379c447e8f192269eede68cd84158d5420