Malicious PDF — malware analysis report

Static analysis result for SHA-256 55f8dead08a75e63…

MALICIOUS

PDF

41.6 KB Created: 2020-05-19 09:06:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dccc67937980e42aacb9bff09d671098 SHA-1: cdbf9c4d4ea82f22d8c86b4d571d892fd8e7337a SHA-256: 55f8dead08a75e63db866d2fbc58735595e14c51b60244caaaaa369e36a7a780
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are consistent with the link farm findings. The primary attack pattern appears to be the distribution of a large number of links, likely for SEO spam or to host further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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.
  • 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 http://olliecakes.net/uploads/1/3/0/5/130540063/130540063.html#letters+of+jrr+tolkien
    • http://migratinglife.com/uploads/1/3/1/4/131437162/5693279.pdf
    • http://twoshadows.com/uploads/1/3/0/5/130551323/a8c2b17a.pdf
    • http://bloominbrilliantdesign.com/uploads/1/3/0/7/130776874/lulotem-wesoj-pajunefijatalef-gavigeseg.pdf
    • http://ieshouston.org/uploads/1/3/1/3/131381288/06fc826c45dc9a.pdf
    • http://csge.eu/uploads/1/3/0/3/130379298/wupetegudupe_sasaferexipi_bawupa_bufekafo.pdf
    • http://tensleepseniorcenter.com/uploads/1/3/0/7/130739225/b11b987957.pdf
    • http://bluxbuilds.com/uploads/1/3/0/6/130620564/d6ae296b.pdf
    • http://obertoelectric.com/uploads/1/3/0/6/130621036/tezez.pdf
    • http://sovereignholistics.com/uploads/1/3/1/3/131378776/nolenemiroji-fojula-wimununadori-setes.pdf
    • http://higginsrestoration.com/uploads/1/3/0/4/130483748/renetazepik.pdf
    • http://vacanzeneiborghi.it/uploads/1/3/0/6/130621194/7fd3f.pdf
    • http://vbaillairge.com/uploads/1/3/1/1/131163953/juwomumuruzup.pdf
    • http://barrysthehuskerbar.com/uploads/1/3/1/8/131856119/7a414.pdf
    • http://anticracker.com/uploads/1/3/0/7/130739046/vajorujefikimu-lanomaduf-kutezuxobivo.pdf
    • http://visionlampasas.com/uploads/1/3/0/6/130639019/6bd98c9.pdf
    • http://cramerclass.com/uploads/1/3/0/7/130739452/521edbf3b04a48.pdf
    • http://alisonhicks4council.com/uploads/1/3/1/3/131380476/wixugakazo.pdf
    • http://playerathleteprofile.com/uploads/1/3/1/4/131452913/gasukudotupuzuvu.pdf
    • http://eminteriorschicago.com/uploads/1/3/0/5/130588376/tidinuvebi.pdf
    • http://doublebastardfab.com/uploads/1/3/1/3/131384281/6fd7ce0.pdf
    • http://asianpaedsderm.org/uploads/1/3/1/0/131069904/4754874.pdf
    • http://whiterockmedical.com/uploads/1/3/1/4/131411896/boxutenugozowe_razid.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/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000073c6.bin
20f126b21569ddf8d23bfffce6346708cc80e6b0b5ff06713b8fe7e2ec6299bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x73C6 10872 bytes

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