Malicious PDF — malware analysis report

Static analysis result for SHA-256 002c43cf9aba7a89…

MALICIOUS

PDF

40.2 KB Created: 2020-04-21 10:29:44 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3aff969fb103f52efbefbdc9c6cb35eb SHA-1: 832356a087f25c51ee53a2d19f5624e9766ea906 SHA-256: 002c43cf9aba7a897c5063c554aef73a47e77f2521e7d15dae44e8da7cf5ff01
96 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, characteristic of a link farm or SEO spam operation. The document body, though heavily obfuscated, appears to reference "chemistry density calculations worksheet answers", suggesting a lure to attract users seeking educational materials. The primary goal seems to be driving traffic to a network of websites, rather than delivering a direct payload.

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://bahefarms.com/uploads/1/3/0/3/130313463/130313463.html#chemistry+density+calculations+worksheet+answers
    • http://broadrippleeyecare.com/uploads/1/3/1/3/131382271/5ddd9.pdf
    • http://midaskingproductions.com/uploads/1/3/0/6/130639092/5635638.pdf
    • http://thehappyhealthylifeonline.com/uploads/1/3/1/4/131453450/1ff489ff95ae.pdf
    • http://referwithfaith.com/uploads/1/3/1/4/131437493/raxirejulo-dugipuga-raviwix-nepewukuzot.pdf
    • http://annieholdencoaching.com/uploads/1/3/0/7/130738929/vurasagoludow.pdf
    • http://charlottesvillecustompc.com/uploads/1/3/0/3/130324419/luwuresik-raluladole-xopikenesi.pdf
    • http://averykholt.com/uploads/1/3/0/7/130775254/xetuvevok.pdf
    • http://accreteequitypartners.com/uploads/1/3/0/4/130483645/fituzevijirese_fosibuzifatuz_niwaburixewobam.pdf
    • http://bhsdemonsfootball.com/uploads/1/3/0/5/130551338/zojel_pivisu_divimof_torusalivazusa.pdf
    • http://neuemusikschuleberlin.com/uploads/1/3/0/4/130478520/penowavebodo-wubonidefaf-moxelarelewi-mibofola.pdf
    • http://sirbonifurnishings.com/uploads/1/3/1/3/131381489/bc72316c2770.pdf
    • http://photobyleencoe.com/uploads/1/3/0/6/130622047/vidoxadud-zuvikosovox-lizegivovafer-vaxitugaz.pdf
    • http://riverbendoutdoors.com/uploads/1/3/1/4/131405948/1619bbc092c.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_off000072c5.bin
54ee303c215cf30022ea4291719a0e74b7b44f53681de6670c114756c2aec6fe		 pdf-font-stream PDF embedded font (sfnt) at offset 0x72C5 8212 bytes

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