Malicious PDF — malware analysis report

Static analysis result for SHA-256 99b896f286eb9f18…

MALICIOUS

PDF

76.8 KB Created: 2020-03-12 12:23:04 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 204a4413f7040b09554b5d0f8bc744b3 SHA-1: 8027d152dcaa520d724e603aea2dcb47ac7cea5b SHA-256: 99b896f286eb9f18c3a8a0663c058a89e38964745395ec99ad2dff462e40ee22
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious File

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 flagged this PDF as malicious with high confidence. The embedded document body text mentions 'Grief counseling and grief therapy', which is likely a lure to disguise the malicious intent of directing users to a link farm. No scripts were extracted from this sample.

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://4gen4.org/uploads/1/3/0/5/130590241/130590241.html#grief+counseling+and+grief+therapy
    • http://danielreist.org/uploads/1/3/0/8/130873740/zuzolafozepopebesix.pdf
    • http://dezhoupukediliuji.f18.ebkf.org/uploads/1/3/0/3/130379123/a5cf42c17080.pdf
    • http://michelleveixmccartan.com/uploads/1/3/0/5/130550879/golagajukax-tamadofaremiw-pepejar-nedorukajota.pdf
    • http://www.ephemerides.solutions/uploads/1/3/0/7/130775493/fiziju_sorikufiro_futonavetu_gasunagugelez.pdf
    • http://netmotiondemo.com/uploads/1/3/0/5/130590036/6d346f591.pdf
    • http://elliotfisher.com/uploads/1/3/0/7/130775624/349ee7114.pdf
    • http://www.especialpack.com/uploads/1/3/0/6/130621593/1615415.pdf
    • http://ctsf.us/uploads/1/3/0/8/130813055/765125.pdf
    • http://mail.americandeckingco.com/uploads/1/3/0/7/130738720/ae86c5.pdf
    • http://www.mother-n-daughter.com/uploads/1/3/0/6/130604646/jiwuvufanadero.pdf
    • http://www.beautifulyoukatiealtobelli.com/uploads/1/3/0/6/130621980/xusokezej.pdf
    • http://mx.youthfulrejuvenations.com/uploads/1/3/0/3/130379121/favuwa.pdf
    • http://mrsmauck.com/uploads/1/3/0/7/130739662/jibopefa.pdf
    • http://fli.pics/uploads/1/3/0/7/130776016/suvorizapotatu.pdf
    • http://hostmaster.extravertednerd.com/uploads/1/3/0/8/130814729/205532907190b8.pdf
    • http://arizonaherding.com/uploads/1/3/0/5/130541624/wenupo-mujaxozaxusam-mizaxenasu.pdf
    • http://www.laos-homestay.com/uploads/1/3/0/6/130604871/wedawulizuro.pdf
    • http://summerhouselavender.com/uploads/1/3/0/4/130483631/vasujajejaxikuvobi.pdf
    • http://www.joshwae.shop/uploads/1/3/0/6/130639083/kuramenavola.pdf
    • http://beasttviptv.com/uploads/1/3/0/3/130379232/3852732.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_007_off0000eb0c.bin
12a0c00365c19b3b4a0cfb89a27184be0613a9ce92897fe730d7ca6cc03af279		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0xEB0C 32796 bytes
font_00_sfnt_off0000c6ad.bin
0efc485bfecffc3e9ad601ef019a4ed7c4acd3ce5dcf48e6d21f45b21f0bad0f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC6AD 1576 bytes
font_01_sfnt_off0000ce4a.bin
4e2ac556ad00c046b5dc8f3cea68a4993ad2871101a805082141c3e570e872d4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE4A 7300 bytes

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