Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0b720ffa999ad54…

MALICIOUS

PDF

76.8 KB Created: 2021-06-06 02:12:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: e1a693df40c31fa6375b05d3e556dc57 SHA-1: 26936155e305274961c9b780b0f84eda4555b5e6 SHA-256: f0b720ffa999ad5487b537ddd86f66c25ffaff7f6ab7ea13fb9279531e9dfa9e
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs suggests the document's primary purpose is to redirect users to potentially harmful content.

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
  • 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.
  • 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://irlanc.ru/pbw?utm_term=how+to+connect+samsung+soundbar+to+lg+tv+via+bluetooth PDF link annotation
    • https://turomanusogagi.weebly.com/uploads/1/3/1/4/131453559/vezaz.pdfIn PDF document text
    • https://fopilifufisi.weebly.com/uploads/1/3/6/0/136055159/4071423.pdfIn PDF document text
    • https://piladokad.weebly.com/uploads/1/3/4/7/134759874/vilagelipi.pdfIn PDF document text
    • https://jakemujilofadam.weebly.com/uploads/1/3/1/3/131380171/kelatobofukafulubaxe.pdfIn PDF document text
    • https://tosoremekik.weebly.com/uploads/1/3/4/7/134771766/lejiwawawek_xixinitudefu.pdfIn PDF document text
    • https://weluperexofabed.weebly.com/uploads/1/3/5/3/135382791/3244012.pdfIn PDF document text
    • https://zedodunojoponex.weebly.com/uploads/1/3/6/0/136083391/42e17602dc367.pdfIn PDF document text
    • https://bijejumutitin.weebly.com/uploads/1/3/1/4/131454352/66f40e114da22a.pdfIn PDF document text
    • https://jaxuguduju.weebly.com/uploads/1/3/4/4/134442137/539da4a08.pdfIn PDF document text
    • https://lepekogiba.weebly.com/uploads/1/3/1/6/131637498/3178144.pdfIn PDF document text
    • https://jowesezowu.weebly.com/uploads/1/3/4/3/134366841/lunaridowepubiraden.pdfIn PDF document text
    • https://gumewutudeg.weebly.com/uploads/1/3/0/8/130813982/kejuv.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
    • http://sepaxebi.pbworks.com/f/echelle_dubois_buyse_cp.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e993ba1f-439e-4ad3-a0b5-4f6192703d73/what_is_the_best_self_introduction_in_an_interview_for_experienced.pdfIn PDF document text
    • http://guronavageba.pbworks.com/w/file/fetch/144567021/palabras_para_felicitar_a_una_amiga_quinceaera.pdfIn PDF document text
    • http://liguduper.pbworks.com/f/85018052907.pdfIn PDF document text
    • http://supijexed.pbworks.com/w/file/fetch/144446037/free_printable_coordinate_graph_pictures_worksheets.pdfIn PDF document text
    • http://sakulibur.pbworks.com/f/1994_ford_f150_repair_manual_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84f846c5-37fb-416a-bd8c-453c50ec3156/basic_accounting_made_easy_win_ballada.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_off0000dff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFF6 5488 bytes
SHA-256: f25814b9ca200c3d1b399ac4a18d515cbafd783230ac0e07b27d6f88fc03d6a9
font_01_sfnt_off0000f280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF280 10656 bytes
SHA-256: 44b283eb4f412833434b431bd59ce1fc1ff610f1bbcc47a856130f8c723905ba
font_02_sfnt_off000116cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CF 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176