Malicious PDF — malware analysis report

Static analysis result for SHA-256 db2e20abd2ab34ce…

MALICIOUS

PDF

39.8 KB Created: 2020-04-04 08:40:33 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 15d7e1c5b2841815ab439a4f477bd984 SHA-1: 07c4d304991f77f922f28d2e1d5c5bc2d8ef35b1 SHA-256: db2e20abd2ab34ce1a4e4ded8cff2f49d01032dc38d205799687aa583ecd8117
94 Risk Score

Malware Insights

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

This PDF document was generated by wkhtmltopdf and contains a large number of external links, many of which point to PDF files on domains that appear to be part of a link farm. The document body text, though partially corrupted, includes a URL that mimics a 'Readworks.org 5th grade answer key', suggesting a lure to trick users into visiting malicious sites. The ML classifier strongly indicated maliciousness, supporting the assessment of a link-farming or SEO spam attack.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://dennisawebb.org/uploads/1/3/0/4/130435622/130435622.html#readworks.org+5th+grade+answer+key
    • http://uksigmanualumni.com/uploads/1/3/1/4/131406861/rekigajoridofopomezo.pdf
    • http://healingtheaddictedmind.org/uploads/1/3/0/2/130289741/609571.pdf
    • http://qualitymenshaircare.com/uploads/1/3/0/6/130621643/pegutijipul.pdf
    • http://219garage.com/uploads/1/3/0/6/130621548/degugewetizipoj.pdf
    • http://supplementsformedicare.com/uploads/1/3/0/4/130483249/fozekegamidijus.pdf
    • http://theslimmingcoffee.com/uploads/1/3/0/4/130435594/zatofaxujolo.pdf
    • http://actual.chat/uploads/1/3/0/6/130603737/3767740.pdf
    • http://mountain-plumbing.com/uploads/1/3/1/4/131437198/doderi.pdf
    • http://corazoncharro.com/uploads/1/3/0/8/130813866/vugosizeved.pdf
    • http://juliettehoedemakers.com/uploads/1/3/1/0/131070298/2ae849251.pdf
    • http://littleblueband.com/uploads/1/3/0/2/130287735/321366.pdf
    • http://skbequine.com/uploads/1/3/0/7/130739802/tafozumok.pdf
    • http://pilanoentertainment.com/uploads/1/3/0/7/130739121/53980022f14.pdf
    • http://writercaroldevine.com/uploads/1/3/0/7/130740000/gidizuzisonon_zigar_jiratuli_bogixixedewekib.pdf
    • http://dmhealthcareproductsinc.com/uploads/1/3/1/3/131381241/d84eb8e08df26e.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_off0000710b.bin
c34def6f2f93e2ba37078ae3f5a631e9fb33447132380e0bc54afc4ff4141b62		 pdf-font-stream PDF embedded font (sfnt) at offset 0x710B 8704 bytes

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