Malicious PDF — malware analysis report

Static analysis result for SHA-256 79a8b020973732d9…

MALICIOUS

PDF

32.7 KB Created: 2020-03-11 13:05:39 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: efa5dca718edae3ccc16ebf1448dc413 SHA-1: 03315645a3f631915ee0c3ea48dcf5152bbb332d SHA-256: 79a8b020973732d9ef11efd475bbd07d0f9a36aa38a8adf368b36d92ce036343
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, many of which point to similarly structured URLs on different domains. The document body, though partially corrupted, suggests a lure related to 'English grammar test for grade 5 pdf'. This indicates a likely SEO spam or phishing campaign aiming to drive traffic to these external sites. The ML classifier strongly supports the malicious nature of this PDF.

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://nobubarcelona-emea-cat.devsite-1.com/uploads/1/3/1/1/131164034/131164034.html#english+grammar+test+for+grade+5+pdf
    • http://peopleofhispresence.com/uploads/1/3/0/6/130621309/a1575ec8e9eb727.pdf
    • http://www.thingsteacherswant.com/uploads/1/3/0/6/130604317/xerul.pdf
    • http://nerjaweddings.es/uploads/1/3/0/5/130588769/fisanalogizox.pdf
    • http://eveliabautista.com/uploads/1/3/0/5/130589227/e38b566a.pdf
    • http://alecfasani.london/uploads/1/3/0/2/130288986/vikarozageselemifur.pdf
    • http://redcarpetfestival.live/uploads/1/3/0/7/130738835/jetumusugudot.pdf
    • http://ajantacookies.com/uploads/1/3/0/6/130640239/7844383.pdf
    • http://www.disjointedmurmurs.com/uploads/1/3/0/5/130542953/1668215.pdf
    • http://victoryflorida.org/uploads/1/3/0/5/130588315/zikimotevas.pdf
    • http://www.passlibe.com/uploads/1/3/0/7/130740571/bevorawedej.pdf
    • http://webdisk.filmityourself.co.uk/uploads/1/3/0/4/130483318/bopidiw-kujakutokepij-lufemitoxavedo.pdf
    • http://smootherwaters.com/uploads/1/3/0/6/130621857/kajiv.pdf
    • http://portabletoiletsmichigan.com/uploads/1/3/0/7/130739375/2046491.pdf
    • http://www.astagandhen.com/uploads/1/3/0/7/130775759/5083514.pdf
    • http://www.endoftenancycleanplymouth.com/uploads/1/3/0/3/130323962/jijamisi_teludolevoguka_gojivevemavo.pdf
    • http://centexpe.com/uploads/1/3/0/9/130969837/kopapujodilo_wozinonulefe_povixuduker_kajipab.pdf
    • http://maleskincareblog.com/uploads/1/3/0/5/130545434/fosapararob.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_off000059f9.bin
df999ae612db7a6957e376669cbbda3b22abeedd3b65c6fe4d8dd486d4539ded		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59F9 6984 bytes

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