Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8a99268f891aa75…

MALICIOUS

PDF

77.5 KB Created: 2021-04-07 20:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: ec400a443c81634982608074f339dac6 SHA-1: 2ad81585c460bbdac30e046319e5cafe98845e81 SHA-256: b8a99268f891aa7590742452146e466ceb7c4eed3a972ba7476de59a6177ea46
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. The presence of a 'download' button lure and ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates a malicious intent to trick users into downloading potentially harmful files. The ML classifier also flagged this PDF with high confidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://resalured.ru/strik?utm_term=the+secret+law+of+attraction+full+movie+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4366011/normal_5fc8f8afc0b3b.pdfIn PDF document text
    • https://cdn.sqhk.co/zuzipogowita/AiehfuO/download_halloween_michael_myers_wallpaper.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379971/normal_5fce3684b8bc2.pdfIn PDF document text
    • https://cdn.sqhk.co/gepabafi/jzwidgH/59090079881.pdfIn PDF document text
    • https://cdn.sqhk.co/todusukiraxi/YIbDZdd/88493984480.pdfIn PDF document text
    • http://nokobefisedo.iblogger.org/cholesterol_lowering_meal_plan.pdfIn PDF document text
    • https://cdn.sqhk.co/velizovatim/ihjgtzO/87595715500.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sikofus.epizy.com/sikh_minority_scholarship_form_2019-_20.pdfIn PDF document text
    • http://didodijore.rf.gd/42719394612.pdfIn PDF document text
    • https://69c5641f-197a-42c1-bef1-daa502c1f1d7.filesusr.com/ugd/948cea_697dcefc8a214e8cb8f624b22feee1a1.pdf?index=trueIn PDF document text
    • https://5fb3b2f4-e86d-4029-b823-ac5950ddf4c1.filesusr.com/ugd/c0aa49_44e19db2200c4dcb870b0c35d9efe384.pdf?index=trueIn PDF document text
    • https://e21f0dd0-e693-4a2a-aa38-6cab66162128.filesusr.com/ugd/34eed6_0661f4db779b40369ec50821b6e32ccb.pdf?index=trueIn PDF document text
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_34f7830d0415423d8d28df126feb5e98.pdf?index=trueIn PDF document text
    • http://sabukizazuse.epizy.com/95847151870.pdfIn PDF document text
    • https://0b196949-32cf-4fe5-af71-696dce18df0b.filesusr.com/ugd/69695d_e93589f159454564bac170847f4ce426.pdf?index=trueIn PDF document text
    • https://d67926d6-99fe-48a4-938f-95006fdf2de6.filesusr.com/ugd/21d82e_0002b1cc14cc4141a1d7d5df1eae1b2b.pdf?index=trueIn PDF document text
    • https://ae0ecf71-49bb-4ac4-bba4-d0f2a20d1af9.filesusr.com/ugd/668a47_287639ef26c74c53bb7dae5eae3dd502.pdf?index=trueIn PDF document text
    • https://60659a61-a27b-47ea-8eac-a81775c62269.filesusr.com/ugd/7a7fb1_5987f527e3ea4ad98961dad7111d0bb1.pdf?index=trueIn PDF document text
    • https://2bb9e989-9ce9-409f-aa8a-839f2ea8d3bf.filesusr.com/ugd/9f8cc2_01c5ccc3826147be88588447ec471775.pdf?index=trueIn PDF document text
    • https://0c2a7d7b-be9d-4ef2-a94c-09ca905cc17d.filesusr.com/ugd/7d21c0_2af7a6c4d6b74819a9d34e1dc97d3747.pdf?index=trueIn PDF document text
    • https://6323cc82-cf72-43ae-bc7a-f8d691a1d37e.filesusr.com/ugd/4f3578_421e1f0194b943a8b7355a30382f4e90.pdf?index=trueIn PDF document text
    • https://f2203da8-4034-475c-a980-a37079f2cd7f.filesusr.com/ugd/d29026_8539e56db5ee409c8f04468ec97c222b.pdf?index=trueIn PDF document text
    • https://ce322291-b3da-4cc2-ae0f-523e25daec44.filesusr.com/ugd/4530da_0da09a37a0e74b2ab2e175c5284dede4.pdf?index=trueIn PDF document text
    • http://xikavab.epizy.com/free_printable_halloween_skeletons.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_off0000f14c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14C 5360 bytes
SHA-256: d408e63ed5f269ccecbb6a253b70e41577e7125633c19be75f477c1839c5bc94
font_01_sfnt_off00010374.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10374 10704 bytes
SHA-256: 6b4a1b64ef552df886d5bdcef8cced968fa468abb140a9c71253a05e7e9cdb90