Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c521167ce80b17…

MALICIOUS

PDF

78.0 KB Created: 2021-03-28 23:30:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 93c889dee6b0323092f02aa520e5b8b9 SHA-1: 25a529478f6142cf6700322676d8fc3e1221a2be SHA-256: 87c521167ce80b173f1dee6f628eb29555c9d130c1b25e51db2f8497b9a4dec4
244 Risk Score

Malware Insights

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

This PDF file was flagged by multiple critical heuristics as a malicious redirector and link farm, and also by a machine learning classifier. The embedded URLs, such as https://crophysi.ru/wix?keyword=sq11+hd+mini+camera+manual, are likely used to direct users to phishing sites or download further malicious content. The PDF structure and numerous external links suggest a phishing or malware distribution campaign.

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://crophysi.ru/wix?keyword=sq11+hd+mini+camera+manual In PDF document text
    • https://cdn.sqhk.co/jizuxadif/cidhKhe/79663732884.pdfIn PDF document text
    • http://pogadai.xyz/22098049430rw4kk.pdfIn PDF document text
    • https://cdn.sqhk.co/perigupa/hgSyYji/nefosubunelojubel.pdfIn PDF document text
    • http://bobujopolodusol.mygamesonline.org/abdomen_anatomy_atlas.pdfIn PDF document text
    • https://cdn.sqhk.co/rawerusiwala/iiGhfGC/gawiruvulovamudanixome.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368487/normal_60027962ee511.pdfIn PDF document text
    • http://vajokopopozikem.medianewsonline.com/pajojumidaru.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4462980/normal_5fcb2ffcc6c39.pdfIn PDF document text
    • http://wersita.fun/75144538581rj5zz.pdfIn PDF document text
    • https://cdn.sqhk.co/butuxolevu/R8gfBja/27545005621.pdfIn PDF document text
    • http://kpovli.ru/francis_van_den_plas-brasschaatj9c95.pdfIn PDF document text
    • https://cdn.sqhk.co/bujavenizake/bGdhbMf/mediafre_games_apk.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/8c267498-33bb-42e7-aa37-00205cb709c7/microsoft_project_download_trial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c203590-ff30-4530-80a3-8cdac30941e6/39435417166.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9b553a5-a51b-4c00-9388-a831412536d3/what_weight_is_bernat_blanket_yarn.pdfIn PDF document text
    • https://ae8c1479-5121-4009-b0ed-8259dbb1205b.filesusr.com/ugd/0aff45_e6677a9814f84eff831ccf8c421701e0.pdf?index=trueIn PDF document text
    • https://d0fd22f1-78bd-4368-960d-2a324028b2bb.filesusr.com/ugd/a4d998_6ea4f03cc76e4e80b971c7681a032ec1.pdf?index=trueIn PDF document text
    • https://50fe66f1-00be-429c-ab6c-57a9f80d6ab9.filesusr.com/ugd/39cb9d_b231e96c7b3943a18f5010feec3799ad.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/53c471a8-3b01-47a7-bd92-dbc3018e8253/how_to_get_free_riot_points_in_league_of_legends_2019.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_off0000f257.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF257 5280 bytes
SHA-256: 7f81d2ef21d6bb8fe0d98afc03b6f1c53c50f3ea16a32bc9d76cb76fefce6857
font_01_sfnt_off0001041f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041F 11560 bytes
SHA-256: 5416217ac1053d7176baddacaab6575594c0756be5219ad6c29a73ade8da213a