Malicious PDF — malware analysis report

Static analysis result for SHA-256 a01c096c29768810…

MALICIOUS

PDF

117.4 KB Created: 2021-06-04 23:21:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31d6f78a3bd93b4b326736a7f94efc06 SHA-1: a2b6f178c834ebde6ee59fe24e256c628ed688ed SHA-256: a01c096c29768810141e4ab4cbdb6be4734e3f82bb7e2e783001f6389f7f78b1
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to PDF files hosted on link farm domains like weebly.com. This is indicative of a link farm or SEO manipulation tactic, likely intended to drive traffic or distribute further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vajawopi.weebly.com/uploads/1/3/4/5/134597817/c1ce516.pdf
    • https://zabebopid.weebly.com/uploads/1/3/4/5/134585494/sukemafazameferonawa.pdf
    • https://static.s123-cdn-static-d.com/uploads/4445892/normal_60b26a6e98708.pdf
    • https://cdn-cms.f-static.net/uploads/4454419/normal_6011933a3cfda.pdf
    • https://dolilugufup.weebly.com/uploads/1/3/0/7/130776220/b097936de3b37.pdf
    • https://solawelosadi.weebly.com/uploads/1/3/1/8/131857655/cef992e64f7.pdf
    • https://kinimozudex.weebly.com/uploads/1/3/4/4/134498073/laxaxosulojo_guzapufuwebumom_birejurep_fojafilaka.pdf
    • https://piwozasemoxusi.weebly.com/uploads/1/3/4/3/134378412/0d683b09359c4.pdf
    • https://vuzupugum.weebly.com/uploads/1/3/1/4/131453250/2a6c27.pdf
    • https://butebonej.weebly.com/uploads/1/3/4/6/134640772/9848c12c.pdf
    • https://static.s123-cdn-static.com/uploads/4383574/normal_6006ce41d9c0e.pdf
    • https://raligeledow.weebly.com/uploads/1/3/4/8/134893256/4687856.pdf
    • https://static.s123-cdn-static.com/uploads/4451549/normal_5fce536969852.pdf
    • https://tivubolo.weebly.com/uploads/1/3/1/8/131857038/c7119cca91c400.pdf
    • https://static.s123-cdn-static-d.com/uploads/4427528/normal_60aff5c38aea6.pdf
    • https://cdn-cms.f-static.net/uploads/4452834/normal_60269f27dbcaf.pdf
    • https://cdn-cms.f-static.net/uploads/4381536/normal_60342280b965a.pdf
    • https://static.s123-cdn-static.com/uploads/4389370/normal_6006d239ac98e.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://feedproxy.google.com/~r/wb/ENAH/~3/mO-5lVq97NI/wb?keyword=virginia%20woolf%20moments%20of%20being%20quotes
    • https://uploads.strikinglycdn.com/files/b10f2eef-16c3-49a8-973b-f57d2818502c/convert_1_cl_en_ml.pdf
    • https://uploads.strikinglycdn.com/files/e7927d19-7dda-47cf-a74b-f2874718fd42/sarataneluvipodibepen.pdf
    • https://uploads.strikinglycdn.com/files/1c9534a9-5734-4626-aa7d-0a9a25282da3/how_to_clean_a_rancilio_coffee_machine.pdf
    • https://uploads.strikinglycdn.com/files/69ca6de5-c140-4ac4-a48a-dc9924525c98/standard_deviation_on_calculator_ti_30x_iis.pdf
    • https://uploads.strikinglycdn.com/files/49532a0b-00db-404d-9d07-6f523218c7b5/donarejolaroju.pdf
    • https://uploads.strikinglycdn.com/files/a21d0d10-f53e-4aa9-ab25-e586e7f755f7/vulad.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_off00018d36.bin
23361927c81eaa55008f4205eee49d1204b2ba407af6a1ac42b93a765fb3faf8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18D36 5412 bytes
font_01_sfnt_off00019fa4.bin
8beab9744af5ecbf8d42dd67ce60eb1b4d1ddf8c91ce9d8c6a00f7d83f64cbf1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x19FA4 11432 bytes

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