Malicious PDF — malware analysis report

Static analysis result for SHA-256 b489d9a9b69a864c…

MALICIOUS

PDF

75.6 KB Created: 2021-03-22 04:46:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 32c7967971c0a2026885a57c01a8caca SHA-1: dd5543a0c36e3fc25e4c265c79df306bf3169c3a SHA-256: b489d9a9b69a864c3fbfa33a2b2138803121441a1d6a4bde9f87f52a8173911e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, flagged as a 'PDF_SEO_LINK_FARM', suggesting an attempt to manipulate search engine rankings or redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://soxebez.ru/123?utm_term=simple+table+of+contents+word+template
    • https://cdn-cms.f-static.net/uploads/4425921/normal_603b7aacb6446.pdf
    • https://cdn-cms.f-static.net/uploads/4455672/normal_6036241f795ef.pdf
    • https://rigawegafo.weebly.com/uploads/1/3/4/5/134587157/xigonop.pdf
    • http://ins.expert/membrane_diffusion_lab_answer_key_phetjwk1z.pdf
    • https://vamarimorojikav.weebly.com/uploads/1/3/4/6/134640123/sukemuro.pdf
    • https://bokowamimufap.weebly.com/uploads/1/3/2/7/132712050/02a80fa4c2.pdf
    • http://habirovradik.ru/exerpeutic_exercise_bike_walmartzx7j9.pdf
    • https://jalesebexiw.weebly.com/uploads/1/3/0/7/130739560/fupuvim.pdf
    • http://freud.icu/wojugiruaykvi.pdf
    • http://bestpriceforukraine.xyz/94645621045zuouy.pdf
    • https://bevowodawalejap.weebly.com/uploads/1/3/4/3/134363876/3bd20c51e4.pdf
    • http://getcabinets.xyz/72859251601g58xv.pdf
    • http://compte-cmbretagne.best/28399681015yajf8.pdf
    • https://cdn-cms.f-static.net/uploads/4374178/normal_604205c589f06.pdf
    • https://tavifarexup.weebly.com/uploads/1/3/4/6/134611028/9737553.pdf
    • https://static.s123-cdn-static.com/uploads/4415070/normal_6002874032daa.pdf
    • https://funopazotasar.weebly.com/uploads/1/3/1/0/131070342/bakif-vuvixiz.pdf
    • https://xikanunifozale.weebly.com/uploads/1/3/1/8/131860479/gubevav.pdf
    • http://mamajan.space/xunibemeoyxws.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/df6cd4c7-9788-410f-bc94-fe3bb3662362/depodove.pdf
    • https://uploads.strikinglycdn.com/files/fa0494a6-4fe9-4dd2-b5cf-f1dd3355ba6a/what_is_the_paradox_in_macbeth_act_1_scene_1.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec0a.bin
b5adc9362a4be224a2b72b43370e4f1cb32dd0de363c1edf67fa38990342f473		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0A 5636 bytes
font_01_sfnt_off0000ff24.bin
0f9faa03d5250cbb5494cc4281af416f6ba16dbb4848c79829159cf368f3270d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFF24 10024 bytes

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