Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c5f2e5dea02b424…

MALICIOUS

PDF

78.3 KB Created: 2021-03-28 20:04:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: b2f195d8c9f1286ca7f59625ffd3e7f2 SHA-1: 90ca1e8005b8b367589fe41af49e2cc2fe486cf5 SHA-256: 5c5f2e5dea02b42488711ebb5fd64b935f50016e78e35659b646079a95264e0b
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 hosting, and one specifically to a known malicious redirector. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf and includes keywords like 'zodiac signs and dates pdf', indicating a lure to disguise the malicious link farm. The presence of numerous external links suggests an attempt to drive traffic to potentially malicious or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dafemum.ru/award?keyword=zodiac+signs+and+dates+pdf In PDF document text
    • https://pivuwolugere.weebly.com/uploads/1/3/4/0/134041199/a08c39.pdfIn PDF document text
    • https://pukapukipek.weebly.com/uploads/1/3/4/6/134636258/68e42a66.pdfIn PDF document text
    • https://dugigoje.weebly.com/uploads/1/3/4/7/134754128/dazulanujo_pixawozodup_titakikabosugaf.pdfIn PDF document text
    • https://juvetobewuneted.weebly.com/uploads/1/3/3/9/133997509/nilofovined.pdfIn PDF document text
    • https://babotiditufo.weebly.com/uploads/1/3/4/6/134694550/vuxujuwef.pdfIn PDF document text
    • https://cdn.sqhk.co/fazituku/ijigjdD/disneyland_hotel_hong_kong_promotion.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471996/normal_6021574266cd7.pdfIn PDF document text
    • https://baxawomegofagu.weebly.com/uploads/1/3/2/8/132815114/zovezanosuxuxekoxiti.pdfIn PDF document text
    • https://cdn.sqhk.co/sepovili/iPQ5icQ/61075914433.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403422/normal_5feff2d229435.pdfIn PDF document text
    • https://jobalexaxikut.weebly.com/uploads/1/3/4/8/134892204/1dc447d799ab7a9.pdfIn PDF document text
    • http://abistrans.ru/wayne_dalton_torquemaster_2_spring_replacementafwad.pdfIn PDF document text
    • https://losiweso.weebly.com/uploads/1/3/1/3/131380476/764052.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379736/normal_60296fdc1838b.pdfIn PDF document text
    • https://jumaxejew.weebly.com/uploads/1/3/1/6/131606465/5009043.pdfIn PDF document text
    • http://demask.fun/asexual_and_sexual_reproduction_worksheet_docxjavl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/xupovobejanam/kaxonogivajejavexeguzelit.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/dadimujekukuwuwojekes.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE828 4940 bytes
SHA-256: 0efc892262dce91f92fd3e08b77f22ecf33d56e06e2a7a35c2b16f0b58b178ef
font_01_sfnt_off0000f90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF90F 10792 bytes
SHA-256: cf4ccd58337678eda000eb111a96c8993419fedf65fdcee352b338409a5e02ec
font_02_sfnt_off00011db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB0 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176